Plaster edge strips



Oct. 10, 1967 TATUM 3,345,789

PLASTER EDGE STRIPS Filed Jan. 4, 1 96'? FIG! l0 o 2 0 o o o r o 2 f o o0 I 20 0 0 o o o o 0 0 oily/ 2 o o 2 0 T o 0 1 0 o o 0 Z4 5 o 0 0 o a Qa o c: o Q 6 FIGZ j Z? 32 M Z INVENTOR ROY E. TATUM ATTORNEYS UnitedStates a Patent v PLASTER EDGE STRIPS Roy E. Tatum, Detroit, Mich.,assignor to Blakely Products Company, Warren, Mich., a corporation ofMichigan I V a Filed Jan. 4, 1967, Ser. No. 607,284

2 Claims. (Cl. 52-367) 4 ABSTRACT on THE DISCLOSURE Gross-reference torelated dpplicdtion This application is a continuation-in-part of mycopending application, Ser. No. 382,138, filed July 13, 1964, now UnitedStates Patent No. 3,307,313.

Background and summary of invention In applying relatively thickfinished coatings of plaster or plaster-like material to wall surfacesit is extremely difficult and tirne consuming to form straight, sharpcorners and edges, as Well as to maintain a uniform coatingthickness.This is particularly true where the coatings are formed of suchplaster-like materials as small pieces and chips of stone mixed withplastic resins or with plaster.

It is therefore an object of this invention to provide edge strips whichform straight edges or joints, during application of relatively thickcoatings of plaster-like material upon wall surfaces, and which stripsalso function to gauge the thickness of such coatings.

It is a further object of this invention to provide an edge or jointstrip which has a portion capable of receiving caulkingrmaterial topermit the simulation of a'conventional caulked joint in a plaster-likewall surface.

Brief description of the drawings FIG. 1 is an elevational view of aportion of the wall surface, prior to coating having various edge stripsarranged thereon.

FIG. 2 is an enlarged cross-sectional view of a pair of joint stripstaken in the direction of arrows 22 of FIG. 1, with the finished coatingin place.

FIG. 3 is a view similar to FIG. 2, but illustrating a modified form ofjoint strip.

Detailed description FIGS. 1 and 2 illustrate the front wall surface ofa rough wall construction 12, which may be of rough plaster, masonry orthe like. A relatively thick, finished wall coat- 'ing 14 is applied tosurface 10 of rough wall 12. The coating may be approximately 7% to Ainch in thickness and may be formed of conventional finish plaster or ofone of the many available plaster-like finishing materials, such as amixture of small chips or pieces of stone and suitable plastic resin orplastic.

Wall surface 10 is prepared for the finished coating 14 by havingmounted thereon a plurality of edge strips. To edge and gauge thethickness of the plaster on both sides of a wall corner, a corner strip16 may be employed. Similarly, at the lower extremity of the finishedcoating surface, base strip 18 is utilized, while at the top of the wallan upper edge strip 20 is applied. Strips 16 and 20 are more fullydisclosed in my above identified parent application, while strips 18 aredescribed more fully in another copending application, Ser. No. 607,285,filed Jan. 4, 1967.

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At the joint in the finished coating, a pair of identical joint strips22 having caulking 24 interposed therebetween is mounted.

Each of these edge strips has its own unique crosssectionalconfiguration to provide the desired edging and gauging function at theparticular wall location. These edge strips may be roll-formed or formedof metal or plastic extrusions. The finished wall coating 14 is appliedafter the strips have ben arranged and secured to wall surface 10.

Joint Strips 22 are more fully illustrated in FIG. .2.

Each of these strips has a generally L-shaped configuration, with a longstrip portion 26 having an inner face 28 adapted to be applied to wallsurface 10 and an outer face 30. The other leg of the L comprises aflange portion 32 with an end face 34 perpendicular to inner face 28, ashort outer face 36, and an inclined face 38 interconnecting faces 36and 30.

1 The strip portion 26 of joint strips 22 is further provided with anumber of spaced openings or slots 40. An initial coating of cement orplaster is locally applied to wall surface 10 and strips 22 are appliedover this initial coating before it has completely dried. Some of thiscement or plaster enters and extends through opening 40, therebyanchoring the strip to the wall. Finish coating 14 is thereafter appliedusing flange outer face 36 as a guide to gauge the thickness of thecoating. Caulking 24 is' then applied to the gap left between the twoadjacent joint strips 22 to complete the installation.

It is to be understood that joint strip 22 may be used singly as an edgestrip if desired, and need not be limited to use in pairs at jointlocations.

A modified form of joint strip is illustrated in FIG. 3. This jointstrip 42 is generally F-shaped in cross-sectional configuration, havinga strip portion 44 adapted to be applied to wall surface 10, an endflange 46 and a second flange 48. The length of flange 48 is such thatits outer edge projects the same distance from the wall surface as doesflange 46. Openings or slots 50 are spaced along the length of stripportion 44 for the same purpose as slots 40 in the embodiment of FIG. 2.It can be seen that when caulking is applied to the space betweenflanges 46 and 48, the effect of two panels of coating 14 separated bycaulking 24 is created. This embodiment offers the advantage over theembodiment of FIG. 2 requiring only single strip to be applied at eachjoint location on the wall, instead of two L-shaped strips.

This invention may be further developed within the scope of thefollowing claims. Accordingly, the above description is to beinterpreted as illustrative of only two operative embodiments of thisinvention, and not in a strictly limited sense.

I now claim:

1. An extruded aluminum edge strip having a long, uniform, solidcross-section for edging a joint in a relatively thick coating ofplaster-like material applied upon a wall surface, comprising incross-section:

a thin, narrow strip portion having a flat wall surface contacting innerfirst face and an opposite fiat outer second face, shorter in lengththan said first face and arranged in a plane converging toward saidinnerface so that said strip portion is tapered in cross-section with onenarrow edge where said first and second faces intersect and an oppositewide edge;

a continuous, narrow, flange portion integrally joined with said stripportion at said wide edge, said flange portion comprising a third flatend face, projecting perpendicularly outwardly beyond a projection ofsaid second face from said strip inner first face at said wide edge, anarrow fourth flat outer face parallel to said first face and extendinggenerally toward said strip portion narrow edge from the outer end ofsaid lel to said first face and extending generally toward third face,and a fifth flat face interconnecting each of said strip portion narrowedge from the outer end of said second and fourth faces at an obtuseangle; said third face, and a fifth flat face interconnecting a secondcontinuous narrow flange substantially parallel each of said second andfourth faces at an obtuse With said first flange portion and integrallyjoined 5 7 angle;

with said strip portion at a point spaced slightly from wherein saidstrip portion may be applied to a wall said first flange portion so asto form a generally F- surface and thereafter covered by said coatingwith shaped cross-section, the second flange being of a said third faceedging said coating and said fourth length such that its outer edgeprojects the same disface gauging the thickness of said coating;

tance from said first face as said first flange portion; 10 said stripsbeing each applied to an unfinished wall wherein said strip portion maybe applied to a wall surface so as to be parallel to each other, andoriented surface and thereafter covered by said coating with said thirdface edging said coating and said fourth face gauging the thickness ofsaid coating.

. A pair of identical extruded aluminum edge strips,

so that said flange portions of said first and second strips areadjacent but spaced slightly from each other thereby to establish a gapbetween the strips defined by said third end faces of each of said twostrips, said gap to be filled with caulking material to simulate aconventional caulked joint.

References Cited thin, narrow strip portion having a flat wall surfaceUNITED STATES PATENTS contacting inner first face and an opposite flatouter second face, shorter in length than said first face and 1,722,6607/1929 conneny 52 '717 X arranged in a plane converging toward saidinner 1742I855 1/1930 Galassl 9418 X face so that said strip portion istapered in cross-sec- 1,989,814 2/1935 MaQNab a1, X tion with one narrowedge where said first and second 2,151,605 3/1939 Lavel'mg X facesintersect and an opposite wide edge; 3,307,313 67 Tatum "V 7 acontinuous, narrow, flange portion integrally joined with said stripportion at said wide edge, said flange FOREIGN PATENTS portioncomprising a third flat end face, projecting 1,132,703 7/ 1962 Germany.

perpendicularly outwardly beyond a projection of said second face fromsaid strip inner first face at FRANK ABBOTT Primary Exammersaid wideedge, a narrow fourth fiat outer face paral- ALFRED PERHAM, AssistantExaminer,

2. A PAIR OF IDENTICAL EXTRUDED ALUMINUM EDGE STRIPS, EACH COMPRISING A LONG, UNIFORM, SOLID CROSS-SECTION FOR EDGING A JOINT IN A RELATIVELY THICK COATING OF PLASTER-LIKE MATERIAL APPLIED UPON A WALL SURFACE, COMPRISING IN CROSS-SECTION; A THIN, NARROW STRIP PORTION HAVING A FLAT WALL SURFACE CONTACTING INNER FIRST FACE AND AN OPPOSITE FLAT OUTER SECOND FACE, SHORTER IN LENGTH THAN SAID FIRST FACE AND ARRANGED IN A PLANE CONVERGING TOWARD SAID INNER FACE SO THAT SAID STRIP PORTION IS TAPERED IN CROSS-SECTION WITH ONE NARROW EDGE WHERE SAID FIRST AND SECOND FACES INTERSECT AND AN OPPOSITE WIDE EDGE; A CONTINUOUS, NARROW, FLANGE PORTION INTEGRALLY JOINED WITH SAID STRIP PORTION AT SAID WIDE EDGE, SAID FLANGE PORTION COMPRISING A THIRD FLAT END FACE, PROJECTING PERPENDICULARLY OUTWARDLY BEYOND A PROJECTION OF SAID SECOND FACE FROM SAID STRIP INNER FIRST FACE AT SAID WIDE EDGE, A NARROW FOURTH FLAT OUTER FACE PARALLEL TO SAID FIRST FACE AND EXTENDING GENERALLY TOWARD SAID STRIP PORTION NARROW EDGE FROM THE OUTER END OF SAID THIRD FACE, AND FIFTH FLAT INTERCONNECTING EACH OF SAID SECOND AND FOURTH FACES AT AN OBTUSE ANGLE; 